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参数资料
| 型号： | IR3080MTR |
| 厂商： | International Rectifier |
| 英文描述： | XPHASE VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT |
| 中文描述： | XPHASE VRD10控制集成电路VCCVID |
| 文件页数： | 20/41页 |
| 文件大小： | 2267K |
| 代理商： | IR3080MTR |
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IR3080
DESIGN PROCEDURES - IR3080 AND IR3086 CHIPSET
IR3080 EXTERNAL COMPONENTS
Oscillator Resistor
Rosc
The oscillator of IR3080 generates a triangle waveform to synchronize the phase ICs, and the switching frequency
of the each phase converter equals the oscillator frequency, which is set by the external resistor R
OSC
according to
the curve in Figure 13.
VID Delay Capacitor C
VIDDEL
After the VID voltage of the integrated linear regulator is above 1.1V, there is a time delay before the soft start of the
converter is initiated. The VID delay time t
VID
can be programmed by an external capacitor between VIDDEL pin
and LGND, and the capacitance is determined by (1).
10
*
66
VID
VIDDEL
C
=
91
.
6
t
(1)
Soft Start Capacitor
C
SS/DEL
and Resistor
R
SS/DEL
Because the capacitor C
SS/DEL
programs four different time parameters, i.e. soft start delay time, soft start time,
over-current latch delay time, and power good delay time, they should be considered together while choosing
C
SS/DEL
.
The SS/DEL pin voltage controls the slew rate of the converter output voltage, as shown in Figure 11. After the
VIDDEL pin voltage rises above 3.91V, there is a soft-start delay time
t
SSDEL,
after which the error amplifier output
is released to allow the soft start. The soft start time
t
SS
represents the time during which converter voltage rises
from zero to V
O.
t
SS
can be programmed by an external capacitor, which is determined by Equation (2).
t
V
Once C
SS/DEL
is chosen, the soft start delay time
t
SSDEL,
the over-current fault latch delay time
t
OCDEL
, and the
delay time
t
VccPG
from output voltage (V
O
) in regulation to Power Good are fixed and shown in Equations (3), (4)
and (5) respectively.
3
*
3
*
CHG
I
09
.
*
09
.
*
DISCHG
I
)
91
.
*
=
=
CHG
I
If faster over-current protection is required, a resistor in series with the soft start capacitor C
SS/DEL
can be used to
reduce the over-current fault latch delay time t
OCDEL
, and the resistor R
SS/DEL
is determined by Equation (6).
Equation (2) for soft start capacitor C
SS/DEL
and Equation (5) for power good delay time t
VccPG
are unchanged,
while the equation for soft start delay time t
SS/DEL
(Equation 3) is changed to Equation (7). Considering the worst
case values of charge and discharge current, R
SS/DEL
should not be greater than 10 k
.
*
09
.
=
DISCHG
I
O
SS
O
SS
CHG
DEL
SS
V
t
I
C
*
10
*
70
*
6
/
=
=
(2)
6
/
/
10
*
70
=
=
DEL
SS
DEL
SS
SSDEL
C
C
t
(3)
6
/
/
10
*
6
=
=
DEL
SS
DEL
SS
OCDEL
C
C
t
(4)
6
/
/
10
*
70
)
91
.
*
O
DEL
SS
O
DEL
SS
VccPG
t
V
C
V
C
(5)
6
/
6
/
/
10
*
6
10
*
6
09
.
DEL
SS
OCDEL
t
DEL
SS
DISCHG
OCDEL
t
DEL
SS
C
C
I
R
(6)
Page 20 of 41
9
/30/04
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相关代理商/技术参数 |
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| IR3080MTRPBF | 功能描述:开关变换器、稳压器与控制器 XPHASE VRD10 CTRL IC CTRL IC 200 to 700mV RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IR3080PBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT |
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| IR3081A | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM VR 10 CONTROL IC |
| IR3081AM | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM VR 10 CONTROL IC |
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